restic: Remove unused variable value

internal/restic/backend_find.go

@@ -67,7 +67,7 @@ func PrefixLength(be Lister, t FileType) (int, error) {
 	}
 
 	// select prefixes of length l, test if the last one is the same as the current one
-	id := ID{}
+	var id ID
 outer:
 	for l := minPrefixLength; l < len(id); l++ {
 		var last string